文献类型：期刊文献

英文题名：Typhoon Control of Precipitation Dual Isotopes in Southern China and Its Palaeoenvironmental Implications

作者：Chen, Fajin[1];Huang, Chao[1];Lao, Qibin[1,2,3];Zhang, Shuwen[4];Chen, Chunqing[1];Zhou, Xin[1];Lu, Xuan[1];Zhu, Qingmei[1]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang, Peoples R China;[2]State Ocean Adm, Marine Environm Monitoring Ctr Beihai, Beihai, Peoples R China;[3]Minist Nat Resources, Key Lab Marine Environm Surv Technol & Applicat, Guangzhou, Peoples R China;[4]Shantou Univ, Inst Main Sci, Shantou, Peoples R China

年份：2021

卷号：126

期号：14

外文期刊名：JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES

收录：SCI-EXPANDED(收录号：WOS:000731527800011)、、Scopus(收录号：2-s2.0-85111415980)、WOS

基金：This work was supported by National Natural Science Foundation of China (U1901213), National Key Research and Development Plan (2016YFC1401403), Guangdong Natural Science Foundation of China (2019B1515120066, 2016A030312004), Guangxi Natural Science Foundation of China (2020GXNSFBA297065), Project of Enhancing School with Innovation of Guangdong Ocean University (GDOU2016050260).

语种：英文

外文关键词：Backward trajectory; dual isotopes; moisture source; precipitation; typhoon

外文摘要：High-resolution stalagmite oxygen isotope (delta O-18) records are widely employed in palaeoclimate studies as indicators of East Asian Monsoon intensity in southern China. A key issue is whether the East Asian Monsoon or other factors control delta O-18 in precipitation in southern China, which requires modern observations to confirm. To understand which factors control the dual isotopes (delta D and delta O-18) of precipitation in southern China, delta D and delta O-18 were measured from 412 precipitation events (including 144 rainwater samples from a total of 43 typhoon events) from May 2015 to April 2020 in Zhanjiang, a tropical city frequently affected by typhoon events in southern China. The overall relationship between delta D and delta O-18 can be expressed as delta D = 8.961 delta O-18 + 6.235; significantly lower intercept and larger slope of this relationship compared to these of the global meteoric water line (GMWL) and the China meteoric water line (CMWL). Remarkably, significantly low D-excess and the lowest delta D and delta O-18 occurred in the typhoon periods, suggesting that typhoon events could bring large amounts of remote moisture to this tropical city from the Western Pacific and South China Sea. The moisture from remote oceans would affect precipitation with the lowest delta O-18 and D-excess, which could be responsible for the deviation of the slope and intercept from those of the CMWL and GMWL. Therefore, variations of the delta O-18 in precipitation are intensively influenced by typhoons, not by the East Asian Monsoon, providing new understanding for the interpretation of palaeo-isotope data in southern China.